Gas drainage device and gas drainage system

Abstract

This invention provides a gas drainage device and system. The gas drainage device includes an annular structure and a drainage pipe. The annular structure has an annular cavity along its circumference, and its inner and outer walls have drainage holes and a drain hole, respectively. The drainage pipe is connected to the annular structure. The two ends of the annular structure are sealed to a first sealing pipe section and a second sealing pipe section, respectively. The mixed fluid in the first and second sealing pipe sections enters the annular cavity through the drainage hole. The gas in the mixed fluid is discharged through the drainage channel, and the water in the mixed fluid is discharged through the drain hole. In this design, the drain hole allows for timely separation and transfer of liquid in the mixed fluid, preventing blockage of the drainage hole and ensuring real-time gas drainage. This gas drainage device has a simple structure, small size, and convenient connection. It does not require disassembly throughout the entire process of directional long-hole drilling and can be used in conjunction with other devices to achieve continuous gas extraction in mines.

Description

Technical Field

[0001] This utility model relates to the field of mine construction technology, and more specifically, to a gas drainage device and a gas drainage system. Background Technology

[0002] During the construction of directional long boreholes in mines, a four-way blowout preventer is usually used to prevent gas from exceeding the limit. The gas in the borehole is connected to the extraction pipeline through a water-gas separator for low-negative-pressure extraction, ensuring that the gas in the borehole does not overflow and cause gas accumulation.

[0003] However, traditional gas blowout preventers are large, heavy, and complicated to connect, and must be disassembled when implementing other processes. Therefore, gas blowout preventers cannot be installed at the beginning of drilling and at the end of drilling. At this time, the gas in the mine cannot be drained in real time. If there is a delay in the process at the beginning of drilling or the end of drilling, the gas will exceed the limit and cause great harm. Utility Model Content

[0004] This invention provides a gas drainage device and a gas drainage system to solve the problem in the prior art that real-time gas drainage cannot be carried out in the early stage of directional long borehole construction and the end of drilling withdrawal, which leads to excessive gas levels in the mine.

[0005] To address the aforementioned problems, according to one aspect of this utility model, a gas extraction device is provided, comprising an annular structure and an extraction pipe. The annular structure has an annular cavity along its circumference, and the inner wall of the annular structure has extraction holes, while the outer wall of the annular structure has drainage holes. Both the extraction holes and drainage holes are connected to the annular cavity. The extraction pipe is connected to the annular structure, and the extraction pipe has an extraction channel that is connected to the annular cavity. The two axial ends of the annular structure are respectively used for sealing connections with a first sealing pipe section and a second sealing pipe section. The mixed fluid within the first and second sealing pipe sections enters the annular cavity through the extraction holes, the gas in the mixed fluid is discharged through the extraction channel, and the water in the mixed fluid is discharged through the drainage holes.

[0006] Furthermore, the inner wall of the annular structure is provided with multiple drainage holes arranged circumferentially, and the drainage holes are located in the upper middle part of the annular structure, while the drainage holes are located at the bottom of the annular structure.

[0007] Furthermore, the diameter of the extraction hole is 3-10mm, and the diameter of the drainage hole is 3-10mm.

[0008] Furthermore, the axial dimension of the ring structure is 70-100mm, and the outer diameter of the ring structure is 80-120mm.

[0009] Furthermore, the gas extraction device also includes a first connecting flange and a second connecting flange. The first connecting flange is installed at one end of the annular structure along the axial direction, and the second connecting flange is installed at the other end of the annular structure along the axial direction. The first connecting flange is used to connect with the flange at the end of the first sealing pipe section, and the second connecting flange is used to connect with the flange at the end of the second sealing pipe section.

[0010] Furthermore, the gas extraction device also includes a first sealing gasket and a second sealing gasket. The first sealing gasket is disposed between the first connecting flange and the flange at the end of the first sealing pipe section, and the second sealing gasket is disposed between the second connecting flange and the flange at the end of the second sealing pipe section.

[0011] Furthermore, the annular structure includes an outer annular cylinder, an inner annular cylinder, and two annular sealing plates. The outer annular cylinder is fitted inside the inner annular cylinder, and the outer and inner annular cylinders are coaxially arranged, forming an annular cavity between them. One annular sealing plate is welded to one end of the outer annular cylinder and one end of the inner annular cylinder, and the other annular sealing plate is welded to the other end of the outer annular cylinder and the other end of the inner annular cylinder to seal the two axial openings of the annular cavity. A drainage hole is located in the inner annular cylinder, and a drain hole is located in the outer annular cylinder. The drainage pipe is welded to the outer annular cylinder.

[0012] According to another aspect of the present invention, a gas drainage system is provided, comprising a drainage pipeline, a first sealing pipe section, a second sealing pipe section, and the aforementioned gas drainage device. The two ends of the annular structure of the gas drainage device are respectively sealed and connected to the first sealing pipe section and the second sealing pipe section. The drainage pipe of the gas drainage device is connected to the drainage pipeline, and the drainage pipeline is under negative pressure to discharge the gas in the drainage pipe.

[0013] Furthermore, the gas drainage system also includes a multi-port valve and a gas-water separator. The first valve port of the multi-port valve is connected to the first sealing pipe section, the second sealing pipe section is installed at the borehole opening of the directional borehole, the second valve port of the multi-port valve is connected to the drainage pipeline, the third valve port of the multi-port valve is connected to the gas-water separator, the gas-water separator is connected to the drainage pipeline, and the gas separated by the gas-water separator enters the drainage pipeline.

[0014] Furthermore, the multi-way valve is a four-way valve, and the gas drainage system also includes a first steel wire hose, a second steel wire hose, a third steel wire hose, and a fourth steel wire hose. The drainage pipe is connected to the extraction pipeline through the first steel wire hose, the second valve port of the multi-way valve is connected to the extraction pipeline through the second steel wire hose, the third valve port of the multi-way valve is connected to the gas-liquid separator through the third steel wire hose, and the gas-liquid separator is connected to the extraction pipeline through the fourth steel wire hose.

[0015] In this scheme, the mixed fluid in the first and second sealing pipe sections enters the annular cavity through the extraction hole. Gas-liquid separation is performed in the annular cavity. The gas in the mixed fluid is discharged upward through the extraction channel, and the water in the mixed fluid is discharged downward through the drain hole. By setting the drain hole, the liquid in the mixed fluid is separated and transferred in a timely manner, avoiding blockage of the extraction hole and affecting the real-time gas extraction. This gas extraction device has a simple structure, small size, and convenient connection. It does not need to be disassembled at the beginning of directional long drilling, the end of drilling withdrawal, or the end of hydraulic fracturing. It can also be used in conjunction with other devices to achieve continuous gas extraction in the mine. Attached Figure Description

[0016] The accompanying drawings, which form part of this application, are used to provide a further understanding of the present invention. The illustrative embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an undue limitation of the present invention. In the drawings:

[0017] Figure 1 A schematic diagram of the gas extraction device provided in an embodiment of this utility model is shown.

[0018] Figure 2 A schematic diagram of the gas extraction system provided in an embodiment of the present invention is shown.

[0019] The above figures include the following reference numerals:

[0020] 10. Ring structure; 12. Drainage hole; 13. Drainage hole;

[0021] 20. Drainage pipe;

[0022] 30. First sealing section;

[0023] 40. Second sealing section;

[0024] 50. Extraction pipeline;

[0025] 60. Multi-port valve; 61. First valve port; 62. Second valve port; 63. Third valve port;

[0026] 70. Gas-water separator;

[0027] 81. First steel wire hose; 82. Second steel wire hose; 83. Third steel wire hose; 84. Fourth steel wire hose. Detailed Implementation

[0028] The technical solutions in at least one embodiment will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of them. The following description of at least one embodiment is merely illustrative and is not intended to limit this application or its applications. Other embodiments obtained by those skilled in the art based on the embodiments of this application without creative effort are all within the scope of protection of this application.

[0029] like Figures 1 to 2 As shown, an embodiment of this utility model provides a gas extraction device, including an annular structure 10 and an extraction pipe 20. The annular structure 10 has an annular cavity along its circumference, and the inner wall of the annular structure 10 has an extraction hole 12, and the outer wall of the annular structure 10 has a drainage hole 13. The extraction hole 12 and the drainage hole 13 are both connected to the annular cavity. The extraction pipe 20 is connected to the annular structure 10, and the extraction pipe 20 has an extraction channel that is connected to the annular cavity. The two ends of the annular structure 10 in the axial direction are respectively used to seal and connect with the first sealing pipe section 30 and the second sealing pipe section 40. The mixed fluid in the first sealing pipe section 30 and the second sealing pipe section 40 enters the annular cavity through the extraction hole 12. The gas in the mixed fluid is discharged through the extraction channel, and the water in the mixed fluid is discharged through the drainage hole 13.

[0030] In this scheme, the mixed fluid in the first sealing pipe section 30 and the second sealing pipe section 40 enters the annular cavity through the extraction hole 12. Gas-liquid separation is performed in the annular cavity. The gas in the mixed fluid is discharged upward through the extraction channel, and the water in the mixed fluid is discharged downward through the drain hole 13. By setting the drain hole 13, the liquid in the mixed fluid is separated and transferred in time, avoiding blockage of the extraction hole 12 and affecting the real-time gas extraction. This gas extraction device has a simple structure, small size, and convenient connection. It does not need to be disassembled at the beginning of directional long drilling, the end of drilling withdrawal, or the end of hydraulic fracturing. It can also be used in conjunction with other devices to achieve continuous gas extraction in the mine.

[0031] like Figure 1 , Figure 2 As shown, the inner wall of the annular structure 10 has multiple extraction holes 12 arranged circumferentially, with the extraction holes 12 located in the upper middle part of the annular structure 10 and the drainage holes 13 located at the bottom of the annular structure 10. The multiple extraction holes 12 improve the gas extraction efficiency; by placing the extraction holes 12 and the drainage holes 13 in the upper middle and bottom parts of the annular structure 10 respectively, gas-liquid separation is better achieved, preventing gas-liquid mixing and clogging of the extraction holes 12, thus reducing the gas extraction efficiency.

[0032] In this embodiment, the diameter of the extraction hole 12 is 3-10mm, and the diameter of the drainage hole 13 is 3-10mm. This hole size design ensures smooth and efficient gas extraction and discharge, while also preventing hole blockage to a certain extent, thus improving the stability and extraction efficiency of the device and reducing maintenance costs.

[0033] In this embodiment, the axial dimension of the annular structure 10 is 70-100mm, and the outer diameter of the annular structure 10 is 80-120mm. This setting of the axial dimension and outer diameter ensures that the device can be well matched with sealing pipe sections of different specifications, without affecting the normal progress of drilling operations. This improves the versatility and adaptability of the device, meeting the needs of different construction conditions.

[0034] In this embodiment, the gas extraction device further includes a first connecting flange and a second connecting flange. The first connecting flange is installed at one axial end of the annular structure 10, and the second connecting flange is installed at the other axial end of the annular structure 10. The first connecting flange is used to connect with the flange at the end of the first sealing pipe section 30, and the second connecting flange is used to connect with the flange at the end of the second sealing pipe section 40. The annular structure 10 is axially connected to the first sealing pipe section 30 and the second sealing pipe section 40 via flanges, improving the sealing performance and reliability of the device.

[0035] In this embodiment, the gas extraction device further includes a first sealing gasket and a second sealing gasket. The first sealing gasket is disposed between the first connecting flange and the flange at the end of the first sealing pipe section 30, and the second sealing gasket is disposed between the flange at the end of the second connecting flange and the flange at the end of the second sealing pipe section 40. The placement of the first and second sealing gaskets at the flange connection further improves the sealing performance of the device connection, preventing gas leakage, reducing extraction efficiency, and thus preventing hazards.

[0036] In this embodiment, the annular structure 10 includes an outer annular cylinder, an inner annular cylinder, and two annular sealing plates. The outer annular cylinder is fitted inside the inner annular cylinder, and the outer and inner annular cylinders are coaxially arranged, forming an annular cavity between them. One annular sealing plate is welded to one end of the outer annular cylinder and one end of the inner annular cylinder, and the other annular sealing plate is welded to the other end of the outer annular cylinder and the other end of the inner annular cylinder to seal the two axial openings of the annular cavity. The extraction hole 12 is located in the inner annular cylinder, the drainage hole 13 is located in the outer annular cylinder, and the extraction pipe 20 is welded to the outer annular cylinder. Through the annular cavity formed by the inner annular cylinder, the outer annular cylinder, and the annular sealing plates, effective separation and extraction of gas and water are achieved, improving the separation efficiency and extraction effect of the device, effectively controlling the gas content in the mine, and ensuring the safety of coal mine operations.

[0037] An embodiment of this utility model also provides a gas extraction system, such as Figure 2As shown, the gas drainage system includes a drainage pipeline 50, a first sealing pipe section 30, a second sealing pipe section 40, and the aforementioned gas drainage device. The annular structure 10 of the gas drainage device has its two ends axially sealed to the first sealing pipe section 30 and the second sealing pipe section 40, respectively. The drainage pipe 20 of the gas drainage device is connected to the drainage pipeline 50. The drainage pipeline 50 is under negative pressure to expel the gas from the drainage pipe 20. Through the negative pressure within the drainage pipeline 50, the gas separated by the gas drainage device is drawn into the drainage pipeline 50 and ultimately transported to the gas treatment system above ground. This improves the stability and drainage efficiency of the system, effectively controls the gas concentration in the coal mine operating environment, prevents gas exceedances, and meets the safety requirements of coal mine operations.

[0038] like Figure 2 As shown, the gas drainage system also includes a multi-port valve 60 and a gas-water separator 70. The first valve port 61 of the multi-port valve 60 is connected to the first sealing pipe section 30, the second sealing pipe section 40 is installed at the borehole opening of the directional borehole, the second valve port 62 of the multi-port valve 60 is connected to the drainage pipeline 50, and the third valve port 63 of the multi-port valve 60 is connected to the gas-water separator 70. The gas-water separator 70 is also connected to the drainage pipeline 50, and the gas separated by the gas-water separator 70 enters the drainage pipeline 50. By setting up the multi-port valve 60, the flexibility and drainage efficiency between pipelines in the gas drainage system are improved. The gas-water separator 70 further improves the separation effect of gas and water, enhancing the system's flexibility and separation efficiency, ensuring the continuity and stability of gas drainage. The flexible switching and efficient separation function of this gas drainage system can meet the gas drainage needs under complex working conditions.

[0039] In this embodiment, the multi-way valve 60 is a four-way valve. The gas drainage system also includes a first steel wire hose 81, a second steel wire hose 82, a third steel wire hose 83, and a fourth steel wire hose 84. The drainage pipe 20 is connected to the extraction pipeline 50 through the first steel wire hose 81. The second valve port 62 of the multi-way valve 60 is connected to the extraction pipeline 50 through the second steel wire hose 82. The third valve port 63 of the multi-way valve 60 is connected to the gas-liquid separator 70 through the third steel wire hose 83. The gas-liquid separator 70 is connected to the extraction pipeline 50 through the fourth steel wire hose 84. The elastic connection of the steel wire hoses ensures the sealing between devices and improves the flexibility and stability of the connection, making operation more convenient and improving drainage efficiency.

[0040] The above descriptions are merely some embodiments of this application and are not intended to limit this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application.

[0041] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the exemplary embodiments according to this application. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0042] Unless otherwise specifically stated, the relative arrangement, numerical expressions, and values ​​of the components and steps described in these embodiments do not limit the scope of this application. It should also be understood that, for ease of description, the dimensions of the various parts shown in the drawings are not drawn to actual scale. Techniques, methods, and devices known to those skilled in the art may not be discussed in detail, but where appropriate, such techniques, methods, and devices should be considered part of the specification. In all examples shown and discussed herein, any specific values ​​should be interpreted as exemplary only and not as limitations. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar reference numerals and letters in the following drawings denote similar items; therefore, once an item is defined in one drawing, it need not be further discussed in subsequent drawings.

[0043] In the description of this application, it should be understood that the orientation or positional relationship indicated by directional terms such as "front, back, up, down, left, right", "horizontal, vertical, horizontal" and "top, bottom" is usually based on the orientation or positional relationship shown in the accompanying drawings, and is only for the convenience of describing this application and simplifying the description. Unless otherwise stated, these directional terms do not indicate or imply that the device or element referred to must have a specific orientation or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on the scope of protection of this application; the directional terms "inner" and "outer" refer to the inner and outer contours relative to the outline of each component itself.

[0044] For ease of description, spatial relative terms such as "above," "on top of," "on the upper surface of," "above," etc., are used herein to describe the spatial positional relationship of a device or feature as shown in the figures to other devices or features. It should be understood that spatial relative terms are intended to encompass different orientations in use or operation beyond the orientation of the device as described in the figures. For example, if the device in the figures were inverted, a device described as "above" or "on top of" other devices or structures would subsequently be positioned as "below" or "under" other devices or structures. Thus, the exemplary term "above" can include both "above" and "below." The device may also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatial relative descriptions used herein will be interpreted accordingly.

[0045] Furthermore, it should be noted that the use of terms such as "first" and "second" to define components is merely for the purpose of distinguishing the corresponding components. Unless otherwise stated, the above terms have no special meaning and therefore should not be construed as limiting the scope of protection of this application.

Claims

1. A gas extraction device, characterized in that, The device includes an annular structure (10) and a drain pipe (20). The annular structure (10) has an annular cavity along its circumference, and the inner wall of the annular structure (10) has a drain hole (12). The outer wall of the annular structure (10) has a drain hole (13). The drain hole (12) and the drain hole (13) are both connected to the annular cavity. The drain pipe (20) is connected to the annular structure (10). The drain pipe (20) has a drain channel inside, and the drain channel is connected to the annular cavity. The two ends of the annular structure (10) in the axial direction are respectively used to seal and connect with the first sealing pipe section (30) and the second sealing pipe section (40). The mixed fluid in the first sealing pipe section (30) and the second sealing pipe section (40) enters the annular cavity from the drain hole (12). The gas in the mixed fluid is discharged from the drain channel, and the water in the mixed fluid is discharged from the drain hole (13).

2. The gas extraction device according to claim 1, characterized in that, The inner wall of the annular structure (10) is provided with a plurality of drainage holes (12) arranged circumferentially, and the plurality of drainage holes (12) are located in the upper middle part of the annular structure (10), while the drainage hole (13) is located at the bottom of the annular structure (10).

3. The gas extraction device according to claim 2, characterized in that, The diameter of the extraction hole (12) is 3-10 mm, and the diameter of the drainage hole (13) is 3-10 mm.

4. The gas extraction device according to claim 1, characterized in that, The axial dimension of the ring structure (10) is 70-100mm, and the outer diameter of the ring structure (10) is 80-120mm.

5. The gas extraction device according to claim 1, characterized in that, The gas extraction device further includes a first connecting flange and a second connecting flange. The first connecting flange is installed at one end of the annular structure (10) along the axial direction, and the second connecting flange is installed at the other end of the annular structure (10) along the axial direction. The first connecting flange is used to connect with the flange at the end of the first sealing pipe section (30), and the second connecting flange is used to connect with the flange at the end of the second sealing pipe section (40).

6. The gas extraction device according to claim 5, characterized in that, The gas extraction device further includes a first sealing gasket and a second sealing gasket. The first sealing gasket is disposed between the first connecting flange and the flange at the end of the first sealing pipe section (30), and the second sealing gasket is disposed between the second connecting flange and the flange at the end of the second sealing pipe section (40).

7. The gas extraction device according to claim 1, characterized in that, The annular structure (10) includes an outer annular cylinder, an inner annular cylinder, and two annular sealing plates. The outer annular cylinder is sleeved on the inner annular cylinder, and the outer annular cylinder and the inner annular cylinder are coaxially arranged. The cavity between the outer annular cylinder and the inner annular cylinder forms the annular cavity. One annular sealing plate is welded to one end of the outer annular cylinder and one end of the inner annular cylinder, and the other annular sealing plate is welded to the other end of the outer annular cylinder and the other end of the inner annular cylinder to seal the two axial openings of the annular cavity. The extraction hole (12) is provided in the inner annular cylinder, the drainage hole (13) is provided in the outer annular cylinder, and the extraction pipe (20) is welded to the outer annular cylinder.

8. A gas extraction system, characterized in that, The gas drainage system includes a drainage pipeline (50), a first sealing pipe section (30), a second sealing pipe section (40), and a gas drainage device according to any one of claims 1 to 7. The two ends of the annular structure (10) of the gas drainage device are respectively sealed to the first sealing pipe section (30) and the second sealing pipe section (40). The drainage pipe (20) of the gas drainage device is connected to the drainage pipeline (50). The drainage pipeline (50) is under negative pressure to discharge the gas in the drainage pipe (20).

9. The gas extraction system according to claim 8, characterized in that, The gas drainage system also includes a multi-port valve (60) and a gas-water separator (70). The first valve port (61) of the multi-port valve (60) is connected to the first sealing pipe section (30), and the second sealing pipe section (40) is installed at the opening of the directional borehole. The second valve port (62) of the multi-port valve (60) is connected to the drainage pipeline (50), and the third valve port (63) of the multi-port valve (60) is connected to the gas-water separator (70). The gas-water separator (70) is connected to the drainage pipeline (50), and the gas separated by the gas-water separator (70) enters the drainage pipeline (50).

10. The gas extraction system according to claim 9, characterized in that, The multi-way valve (60) is a four-way valve. The gas extraction system also includes a first steel wire hose (81), a second steel wire hose (82), a third steel wire hose (83), and a fourth steel wire hose (84). The extraction pipe (20) is connected to the extraction pipeline (50) through the first steel wire hose (81). The second valve port (62) of the multi-way valve (60) is connected to the extraction pipeline (50) through the second steel wire hose (82). The third valve port (63) of the multi-way valve (60) is connected to the gas-water separator (70) through the third steel wire hose (83). The gas-water separator (70) is connected to the extraction pipeline (50) through the fourth steel wire hose (84).

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